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Gabbro is a dark-colored coarse-grained intrusive igneous rock. The specimen shown above is about two inches (five centimeters) across. Gabbro is a coarse-grained, dark-colored, intrusive igneous rock. It is usually black or dark green in color and composed mainly of the minerals plagioclase and augite. It is the most abundant rock in the deep oceanic crust. Gabbro has a variety of uses in the construction industry.
Additionally, they contain somewhat more gas than do the ultramafic magmas, but not nearly so much as the felsic magmas. Gabbro is the name given to intrusive mafic rocks, whereas basalt is the name given to extrusive mafic rocks. Mafic rocks are produced in a variety of plate tectonic settings (divergent plate boundaries such as mid-ocean ridges, continental rifts such as our own Basin